Question

要铺满一个长 $12$ 英尺、宽 $9$ 英尺的长方形地板，需要多少平方码地毯？（一码等于 $3$ 英尺。）

How many square yards of carpet are required to cover a rectangular floor that is $12$ feet long and $9$ feet wide? (There are $3$ feet in a yard.)

$12$

$36$

$108$

$324$

$972$

先把两个边长都从英尺转换成码

Convert both side lengths from feet to yards first.

再将两个以码为单位的长度相乘，得到平方码

Then multiply the two yard measurements to get square yards.

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一边长 $12$ 英尺，即 $\dfrac{12}{3} = 4$ 码。

另一边长 $9$ 英尺，即 $\dfrac{9}{3} = 3$ 码。

因为尺寸是 $4$ 码乘 $3$ 码，所以面积为 $4\cdot3=12$ 平方码。

所以正确答案是 A。

Since one side is $12$ feet, it would be $\dfrac{12}{3} = 4$ yards.

Since another side is $9$ feet, it would be $\dfrac{9}{3} = 3$ yards.

Since the dimensions are $4$ yards by $3$ yards, the area is $4\cdot3=12$ square yards.

Thus, the correct answer is A .